Double pipe and method for manufacturing same
AssigneeYutaka Giken Co., Ltd.
InventorsKoji Yamamoto, Takashi Wagatsuma, Ryoji Noda
Life of this patent
Estimating the term…
Abstract
A double pipe includes an outer pipe in which an inner pipe is placed, and a spacer that maintains a clearance between the inner pipe and the outer pipe. At least a part of the spacer is press-fitted by an inner circumferential surface of the outer pipe and an outer circumferential surface of the inner pipe. More specifically, the outer pipe includes a diameter-reduced portion having undergone diameter reduction by plasticity processing. An inner circumferential surface of the diameter-reduced portion is present across the entire circumference other than the opening of the spacer, and presses an outer circumferential surface of the spacer inwardly in the radial direction.
Claims16
A double pipe comprising:
- an outer pipe in which an inner pipe is placed;
- a spacer that maintains a clearance between the inner pipe and the outer pipe;
- and
- a pipe through which a fluid is capable of flowing,
- wherein at least a part of the spacer is press-fitted by an inner circumferential surface of the outer pipe and by an outer circumferential surface of the inner pipe, and
- wherein the pipe comprises an abutting surface that abuts an outer circumferential surface of the outer pipe.
A double pipe comprising an outer pipe in which an inner pipe is placed, and a spacer that maintains a clearance between the inner pipe and the outer pipe, wherein:
- at least a part of the spacer is press-fitted by an inner circumferential surface of the outer pipe and by an outer circumferential surface of the inner pipe;
- the double pipe comprises a bent portion that is at least a part of the double pipe itself;
- and
- the spacer placed at the bent portion is formed in a spiral shape wound around the outer circumferential surface of the inner pipe in the bent portion.
Dependencies are inferred from the claim text.